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From: Paul Davey <>
To: Manivannan Sadhasivam <>
	Bhaumik Bhatt <>,
	Hemant Kumar <>,
	Paul Davey <>
Subject: [PATCH v2 1/2] bus: mhi: Fix pm_state conversion to string
Date: Wed, 23 Jun 2021 14:43:26 +1200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On big endian architectures the mhi debugfs files which report pm state
give "Invalid State" for all states.  This is caused by using
find_last_bit which takes an unsigned long* while the state is passed in
as an enum mhi_pm_state which will be of int size.

Fix by using __fls to pass the value of state instead of find_last_bit.

Signed-off-by: Paul Davey <>
Not adding Tested-by or Reviewed-by tags as this patch has changed
substantially from v1.

 drivers/bus/mhi/core/init.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
index c81b377fca8f..0706eb046f2a 100644
--- a/drivers/bus/mhi/core/init.c
+++ b/drivers/bus/mhi/core/init.c
@@ -79,9 +79,12 @@ static const char * const mhi_pm_state_str[] = {
 const char *to_mhi_pm_state_str(enum mhi_pm_state state)
-	int index = find_last_bit((unsigned long *)&state, 32);
+	int index;
-	if (index >= ARRAY_SIZE(mhi_pm_state_str))
+	if (state)
+		index = __fls(state);
+	if (!state || index >= ARRAY_SIZE(mhi_pm_state_str))
 		return "Invalid State";
 	return mhi_pm_state_str[index];

  reply	other threads:[~2021-06-23  2:43 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-23  2:43 [PATCH v2 0/2] bus: mhi: Fix MHI on big endian architectures Paul Davey
2021-06-23  2:43 ` Paul Davey [this message]
2021-06-23  2:43 ` [PATCH v2 2/2] bus: mhi: Fix MHI DMA structure endianness Paul Davey
2021-06-24  2:11   ` Bhaumik Bhatt
2021-06-24 23:12     ` Paul Davey

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